It takes forever to actually DO the problem, like what would take me 10 minutes on paper took about 2 hours on this. Then when you finish it, heck, you have to do A WHOLE NOTHER LOAD OF CRAP! And what do you get out of finishing the lessons? Well, you get coins, and the coins you can use for games in the app but the games are crap and they are only 2 minutes long so when your done you have to go through about 5 hours more of work for a game. DO NOT GET THIS APP. Get a different one. Oh and also, can we talk about the fact that if you do enough looking and detective stuff you can find out the people in the lessons are in COLLAGE? This is so stupid. 20 year olds cant figure out what 30 divided by 10 is. What hole were they trapped in for the last 15 years?